First Cat Cloned
Scientists at Texas A&M University cloned the first domestic cat, named CC (Copy Cat)
December 22, 2001
CC: The World's First Cloned Cat
On December 22, 2001, scientists at Texas A&M University announced the birth of CC — short for "Carbon Copy" or "Copy Cat" — the world's first cloned domestic cat. CC was created using somatic cell nuclear transfer, the same technique used to clone Dolly the sheep in 1996. A cell nucleus from a female cat named Rainbow was inserted into an egg cell that had its own nucleus removed. The resulting embryo was implanted into a surrogate cat, and CC was born on December 22. The achievement demonstrated that cloning could work across a range of mammalian species, not just sheep.
What Made CC Surprising
CC looked noticeably different from her genetic donor, Rainbow. Rainbow was a calico cat with distinctive orange, black, and white patches. CC was a brownish tabby with white. This surprised many people who expected a clone to be an exact copy. The difference was explained by the random nature of X-chromosome inactivation — the process by which certain genes are silenced during development. Since coat color in cats is partly determined by this random process, a genetic copy can look quite different. CC proved that genes are not destiny: environment and developmental chance matter enormously even between genetically identical individuals.
The Ethics of Pet Cloning
CC's creation opened a commercial market for pet cloning. Companies began offering cat and dog cloning services for prices that can reach $50,000 or more. Animal welfare advocates criticize the practice, noting that cloning requires many failed embryo attempts and surrogate animals, and that the clone will not necessarily have the same personality as the original pet. CC herself lived a healthy life, eventually having kittens of her own — proving that cloned mammals can reproduce normally. Her birth raised questions about the ethics and limits of biotechnology that are still being debated today, connecting to broader conversations about what science should and should not do.